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Ohara, Takashi
Nihon Kessho Gakkai-Shi, 56(5), p.301 - 306, 2014/10
no abstracts in English
Wada, Yuki; Mitomo, Hiroshi*; Kasuya, Kenichi*; Nagasawa, Naotsugu; Seko, Noriaki; Katakai, Akio; Tamada, Masao
Journal of Applied Polymer Science, 101(6), p.3856 - 3861, 2006/09
Times Cited Count：21 Percentile：53.63(Polymer Science)Radiation-induced graft polymerization of acrylic acid (AAc) on the surface of poly(3-hydroxybutyric acid) (PHB) film was carried out by applying pre-irradiation techniques. The PHB films grafted with AAc (PHB-g-AAc) possessed a degree of grafting higher than 5% have completely lost the enzymatic degradability. The enzymatic degradability of the grafted film was recovered by remolding. And the highest enzymatic degradation rate was observed to grafted films with AAc 10% of degree. Difference of enzymatic degradability of PHB-g-AAc film was caused by decrement of amount of enzyme contact and decrement of crystallinity of PHB by remolding.
Tamada, Taro
Baiosaiensu To Indasutori, 63(1), p.27 - 30, 2005/01
no abstracts in English
Niimura, Nobuo; Chatake, Toshiyuki; Kurihara, Kazuo; Maeda, Mitsuru
Cell Biochemistry and Biophysics, 40(3), p.351 - 369, 2004/06
Times Cited Count：24 Percentile：25.29(Biochemistry & Molecular Biology)Neutron diffraction provides an experimental method of directly locating hydrogen atoms in proteins. High resolution neutron diffractometers dedicated to biological macromolecules (BIX-type diffractometer) have been constructed at the Japan Atomic Energy Research Institute (JAERI) and they have been used in the 1.5 AA -resolution crystal structure analyses of several proteins.
Chimi, Yasuhiro; Ishikawa, Norito; Iwase, Akihiro*
Materials Research Society Symposium Proceedings, Vol.792, p.379 - 384, 2004/00
We have studied high-energy ion irradiation effects in bismuth by measuring the electrical resistivity at low temperature in relation to its structural change. Bismuth thin films (300-600 
10 K with several kinds of energetic (100-200 MeV) heavy ions. The resistivity of the specimen is measured in-situ at 
7 K during irradiation. After irradiation, annealing behavior of the resistivity is observed up to 35 K. The temperature dependence of the resistivity during annealing shows an abrupt increase around 20 K, implying re-crystallization of irradiation-induced amorphous region. Since amorphous bismuth also shows a superconducting transition below 6 K, high-density electronic excitation due to energetic heavy-ion irradiation may induce columnar region of superconducting amorphous bismuth in normal crystalline bismuth. We are trying to detect the superconducting transition as a result of irradiation-induced amorphization.
X-ray diffractionWang, W. H.*; Wen, P.*; Zhao, D. Q.*; Pan, M. X.*; Okada, Taku; Utsumi, Wataru
Applied Physics Letters, 83(25), p.5202 - 5204, 2003/12
Times Cited Count：21 Percentile：61.65(Physics, Applied)no abstracts in English
Inoue, Yutaka; Kobayashi, Kazuhiro; Yamaki, Tetsuya; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
Dai-2-Kai 21-Seiki Rengo Shimpojiumu; Kagaku Gijutsu To Ningen Rombunshu, p.257 - 260, 2003/00
We prepared crosslinked fluoropolymer electrolyte membranes for use in fuel cells and then investigated their structural properties by X-ray diffraction (XRD) analysis. The radiation-induced grafting of styrene into crosslinked polytetrafluoroethylene (PTFE) films and subsequent sulfonation enabled us to obtain the electrolyte membrane with a sufficient ion exchange capacity, which exceeds that of the commercially-available film, Nafion. As the crosslinking and styrene grafting reactions proceeded, the size of the PTFE crystallites in the film became smaller, thereby decreasing the film crystallinity. Interestingly, in contrast to Nafion, the resulting sulfonated membranes were found to have high crystallinity.
Aihara, Jun; Hojo, Kiichi; Furuno, Shigemi*; Ishihara, Masahiro; Hayashi, Kimio
Journal of Electron Microscopy, 51(2), p.93 - 98, 2002/05
Times Cited Count：6 Percentile：20.46(Microscopy)no abstracts in English
Aoyagi, Takayoshi*; *; Mihara, Morihiro; Okutsu, Kazuo*; Maeda, Munehiro*
JNC TN8400 2001-024, 103 Pages, 2001/06
JNC-TN8400-2001-024.pdf:8.84MB
In the disposal concept of TRU waste, concentrated disposal of wastes forms in large cross-section underground cavities is envisaged, because most of TRU waste is no-heat producing in spite of large generated volume as compared with HLW. In the design of engineered barrier system based on large cross-section cavities, it is necessary to consider the long-term mechanical process such as creep displacement of the host rock from the viewpoint of the stability of engineered barrier system. In this study, the long-term creep displacement of the host rock was calculated using the non-linear viscoelasticity model and the effects on the stability of engineered barrier system was evaluated. As a result, in the disposal concept of crystalline rock, no creep displacement occurred at the time after 1 milion year. On the other hand, in the disposal concept of sedimentary rock, creep displacement of 8090mm occurred at the time after 1 milion year. Also, in this calculation, a maximum reduction of 45mm concerned with the thickness of buffer material was estimated. But these values resulted within allowance of design values. Therefore, these results show that the effects of the creep displacement on the stability of engieered barrier system would not be significant.
to obtain the high U solution; *; Sakurai, Koji*; ; Nomura, Kazunori; *
JNC TN8400 2000-032, 98 Pages, 2000/12
JNC-TN8400-2000-032.pdf:1.94MB
Concerning the preparation of high U solution for the crystallization process and the application of UO powder dissolution to that, the effects of final U concentration, dissolution temperature, nitric acid concentration and powder size on the dissolution of UO powder in the nitric acid where the final U concentration was 800g/L were investigated. The experimental results showed that the solubility of UO decreased with the increase of final UO concentration and powder size, and with the decrease of dissolution temperature and nitric acid concentration. It was also confirmed that in the condition where the final U concentration was sufficiently lower than the solubility of U, UO dissolution behavior in the high U solution could be estimated with the equation based on the fragmentation model which we had already reported. Based on these experimental results, the dissolution behavior of irradiated MOX fuel in high U solution was estimated and the possibility of supplying high U solution to the crystallization process was discussed. In the preparation of high U solution for the crystallization process, it was estimated that the present dissolution process (dissolution for fuel pieces of about 3cm long) needed a lot of time to obtain a high dissolution yield, but it was shorted drastically by the pulverization of fuel pieces. The burst of off-gas at the early in the dissolution of fuel powder seems to be avoidable with setting the appropriate dissolution condition, and it is important to optimize the dissolution condition with considering the capacity of off-gas treatment process.
; ; Shimizu, Kazuhiko; Miyahara, Kaname; ; Seo, Toshihiro; Fujita, Tomoo
JNC TN1410 2000-008, 100 Pages, 2000/10
JNC-TN1410-2000-008.pdf:4.23MB
no abstracts in English
Nagano, Tetsushi
Gekkan Chikyu, 22(7), p.429 - 434, 2000/07
no abstracts in English
Aihara, Jun; Hojo, Kiichi; Furuno, Shigemi; Ishihara, Masahiro; Hayashi, Kimio
Nuclear Instruments and Methods in Physics Research B, 166-167, p.379 - 384, 2000/05
Times Cited Count：8 Percentile：50.62(Instruments & Instrumentation)no abstracts in English
*; *; *; *
JNC TJ8400 2000-061, 92 Pages, 2000/03
JNC-TJ8400-2000-061.pdf:8.79MB
Crystallization procedure is considered to have an advantage in recovering rather pure uranium from contaminated uranium solution and to be applicable for a new reprocessing process. It was confirmed until last year that the reprocessing process with crystallization procedure has a sufficient advantage. But the data for Pu crystallization is very rare. although it is necessary for design of the process with crystallization procedure. In this study, a beaker scale plutonium test was performed in AEA Technology Harwell Laboratory to confirm a behavior of Pu (IV) nitrate under crystallization condition. The results were examined by Mitsubishi Materials Corporation. Test item was a measurement of temperature in case of Pu (IV) nitrate crystallization or freezing of the solution in the following six parameters. (Pu(g/L):200, 100, 50, HNO
(m):6, Pu valence:4). (Pu(g/L):200, 100, 50, HNO(m):4, Pu valence:4). Test results were as follows. (1)Pu(IV) nitrate crystallization was not observed even in the case 200g Pu/L and HNO 6M and 4M which were considered to the best condition but crystal of HO and HNO 
3HO were observed. (2)Similar results were obtained for the other parameter with lower Pu concentration. (3)We can estimate that Pu(IV) nitrate crystallization will not occurred in the reprocessing process with crystallization procedure. (4)The solubility data of Pu(NO)
- HNO-HO system was obtained.
*; *; Fumoto, Hiromichi*; *; *
JNC TJ9400 2000-001, 112 Pages, 2000/02
JNC-TJ9400-2000-001.pdf:6.67MB
The purpose of this study is to investigate the possibility of new reprocessing process for the purpose of introducing pipeless plant concept, where aqueous separation methods other than solvent extraction method are adopted in order to develop more economical FBR fuel (MOX fuel) reprocessing process. At it's first stage, literature survey on precipitation method, crystallization method and ion-exchange method was performed. Based on the results, following processes were candidated for pipeless reprocessing plant. (1)The process adopting crystallization method and peroxide precipitation method (2)The process adopting oxalate precipitation method (3)The process under mild aqueous conditions (crystallization method and precipitation method) (4)The process adopting crystallization method and ion-exchange method (5)The process adopting crystallization method and solvent extraction method The processes (1)(5) were compared with each others in terms of competitiveness to the conventional reference process, and merits and demerits were evaluated from the viewpoint of applicability to pipeless reprocessing plant, safety, economy, Efficiencies in consumption of Resources, non-proliferation, and, Operation and Maintenance. As a result, (1)The process adopting crystallization method and peroxide precipitation method was selected as the most reasonable process to pipeless plant. Preliminary criticality safety analyses, main process chemical flowsheet, main equipment list and layout of mobile vessels and stations were reported for the (1) process.
Sasuga, Tsuneo; Kudo, Hisaaki
Polymer, 41(1), p.185 - 194, 2000/00
Times Cited Count：45 Percentile：79.19(Polymer Science)no abstracts in English
*; *; *; Yagi, Toshiaki; Morita, Yosuke
Denki Gakkai; Yuden, Zetsuen Zairyo Kenkyukai Shiryo DEI-97-147155, p.13 - 18, 1997/12
no abstracts in English
Onuki, Toshihiko; Yanase, Nobuyuki; Sekine, Keiichi; Isobe, Hiroshi; Nagano, Tetsushi; Sakamoto, Yoshiaki
Journal of Nuclear Science and Technology, 34(12), p.1153 - 1158, 1997/12
Times Cited Count：26 Percentile：86.43(Nuclear Science & Technology)no abstracts in English
